Stonington Connecticut ZIP Codes

Stonington holds a single ZIP code.

Every ZIP code in Stonington

The complete list of Stonington, Connecticut ZIP codes with the planning region each falls in.
ZIP code	Planning region
06378	Southeastern Connecticut Planning Region

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Stonington codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Stonington. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

How these codes cluster

Every Stonington ZIP code begins 063. Those first three digits identify the sectional center facility that processes mail for this part of Connecticut. Statewide that range covers 39 ZIP codes, so Stonington accounts for 3% of it.

Every Connecticut ZIP prefix and the region it covers →

Area codes covering Stonington

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Stonington occupies.

Stonington Connecticut area codes in full →

Where Stonington's ZIP codes sit

Each point is one Stonington ZIP code, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Cities near Stonington

The closest places to Stonington with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Groton Connecticut ZIP codes	8.7 mi	2 ZIP codes
New London Connecticut ZIP codes	10 mi	1 ZIP code
Norwich Connecticut ZIP codes	18 mi	1 ZIP code
Oakdale Connecticut ZIP codes	18 mi	1 ZIP code
Jewett City Connecticut ZIP codes	19 mi	1 ZIP code
Danielson Connecticut ZIP codes	33 mi	1 ZIP code
Madison Connecticut ZIP codes	37 mi	1 ZIP code
Middletown Connecticut ZIP codes	42 mi	2 ZIP codes

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.